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Capital Ratios - Capital Ratios for Park and Each Subsidiary (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital Conservation Buffer | 1.25% | 0.625%
Park National Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Risk-Based Capital | 10.35% | 9.87%
Tier One Risk Based Capital Required for Capital Adequacy | $ 325,054 | $ 324,115
Common Equity Tier 1 | 10.35% | 9.87%
Common Equity Tier One Capital Required for Capital Adequacy | $ 243,791 | $ 243,086
Total Risk-Based | 11.60% | 11.24%
Capital Required for Capital Adequacy | $ 433,406 | $ 432,153
Leverage Capital Required For Capital Adequacy To Average Total Assets | 4.00% | 4.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 6.00% | 6.00%
Tier One Risk Based Capital Required to be Well Capitalized | $ 433,406 | $ 432,153
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets | 4.50% | 4.50%
Common Equity Tier One Capital Required to be Well-Capitalized | $ 352,142 | $ 351,125
Leverage | 7.36% | 7.34%
Tier One Leverage Capital Required for Capital Adequacy | $ 304,722 | $ 290,671
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00%
Capital Required to be Well Capitalized | $ 541,757 | $ 540,192
Tier One Risk Based Capital | $ 560,530 | $ 533,215
Common Equity Tier 1 Capital Required To Be Well Capitalized To Average Total Assets | 6.50% | 6.50%
Common Equity Tier One Capital | $ 560,530 | $ 533,215
Risk Based Capital | $ 628,440 | $ 607,269
Leverage Capital Required To Be Well Capitalized To Average Total Assets | 5.00% | 5.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 8.00% | 8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%
Tier One Leverage Capital | $ 560,530 | $ 533,215
Tier One Leverage Capital Required to be Well Capitalized | $ 380,903 | $ 363,339
Park |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Risk-Based Capital | 13.22% | 12.83%
Tier One Risk Based Capital Required for Capital Adequacy | $ 329,235 | $ 328,673
Common Equity Tier 1 | 12.94% | 12.55%
Common Equity Tier One Capital Required for Capital Adequacy | $ 246,927 | $ 246,505
Total Risk-Based | 14.14% | 14.32%
Capital Required for Capital Adequacy | $ 438,981 | $ 438,231
Leverage Capital Required For Capital Adequacy To Average Total Assets | 4.00% | 4.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 6.00% | 6.00%
Tier One Risk Based Capital Required to be Well Capitalized | $ 329,235 | $ 328,673
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets | 4.50% | 4.50%
Leverage | 9.44% | 9.56%
Tier One Leverage Capital Required for Capital Adequacy | $ 307,441 | $ 293,916
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00%
Capital Required to be Well Capitalized | $ 548,726 | $ 547,789
Leverage Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets | 4.00% | 4.00%
Tier One Risk Based Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets | 8.50% | 8.50%
Common Equity Tier 1 Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets | 7.00% | 7.00%
Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets | 10.50% | 10.50%
Tier One Risk Based Capital | $ 725,221 | $ 702,651
Common Equity Tier One Capital | 710,221 | 687,651
Risk Based Capital | $ 775,867 | $ 784,406
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 6.00% | 6.00%
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%
Tier One Leverage Capital | $ 725,221 | $ 702,651
Minimum |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital Conservation Buffer | 0.00% |
Maximum |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital Conservation Buffer | 2.50% |

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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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